CVE-2026-39976: Laravel Passport provides OAuth2 server support to Laravel

Routine

HIGH 7.1UPGRADE

CVE-2026-39976 is a high-severity flaw (CVSS 7.1) affecting passport. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Laravel Passport provides OAuth2 server support to Laravel. From 13.0.0 to before 13.7.1, there is an Authentication Bypass for client_credentials tokens. the league/oauth2-server library sets the JWT sub claim to the client identifier (since there's no user). The token guard then passes this value to retrieveById() without validating it's actually a user identifier, potentially resolving an unrelated real user. Any machine-to-machine token can i

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: laravel

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 17:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

laravel passport UPGRADE

Affected: >= 13.0.0 and < 13.7.1

Fixed in: 13.7.1

Safe to downgrade to: a release before 13.0.0

1. Check installed version

apt-cache policy passport || rpm -q passport || passport --version

2. UPGRADE to 13.7.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade passport

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade passport

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 13.0.0 (Debian / Ubuntu)

apt-cache madison passport sudo apt install passport=<VERSION_BEFORE_13.0.0> sudo apt-mark hold passport

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list passport sudo dnf downgrade passport-<VERSION_BEFORE_13.0.0> sudo dnf versionlock add passport

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39976?

passport: upgrade to 13.7.1. Exact commands for each OS are on this page.

Is CVE-2026-39976 being exploited?

CVE-2026-39976 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39976 affect?

CVE-2026-39976 affects passport. Severity is high (CVSS 7.1). Laravel Passport provides OAuth2 server support to Laravel. From 13.0.0 to before 13.7.1, there is an Authentication Bypass for client_credentials tokens. the league/oauth2-server library sets the JWT sub claim to the client identifier (sin

How urgent is CVE-2026-39976?

Priority 35/100. High severity; Public exploit reference

Software pages

Laravel vulnerabilities

References

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